• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.1180-1185
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• 2009

Database is constructed according to the development of information contents technology. But the construction of database using bio-information has not been developed. because it is difficult to collect bio-information. This paper presents how to construct database about sensing temperature and tilt of cow based on bio-information using RF communication. The system consists of 8bit micro-controller, tilt sensor, temperature sensor and RF module.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.621-624
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• 2001

This paper designs for the real time spectrum analysis on RF signal with DSP processor (TMS320c6$\times$01). The core block has a couple of parts, RF and DSP module. The experiment and performance of system is tested by ESC to generate WCDMA and IS-95C CDMA. The system is enable to analyze the spectrum under lower 5 dB gain to another equipments.

• Information and Communications Magazine
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• v.24 no.3
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• pp.76-86
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• 2007

This paper describes the RF performance issues of UE RF Transceiver for W-CDMA system based on 3GPP specifications. the parameters of transmitter and receiver are derived from the viewpoint of RF performance. In order for UE to achieve high performance, the transceiver performance requirements such as ACIR, EVM, Peak Code Domain Error, spectrum emission mask, frequency error stability and TX power control dynamic range for transmitter and reference sensitivity level, blocking characteristics, noise figure, ACS, linearity, AGC dynamic range for receiver are considered. On the basis of the required parameters, the UE RF transceiver is designed and then implemented. The evaluation of RF performance is accomplished through practical test scenarios.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.9
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• pp.1271-1274
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• 2021

RF fingerprinting based on deep learning (DL) has gained interests as a means to improve the security of near field communication (NFC) by allowing identification of NFC tags based on unique physical characteristics. To achieve high accuracy in the identification of NFC tags, it is crucial to utilize a large number of training data, however it is hard to collect such dataset in practice. In this study, we have provided new methodology to generate RF waveform from NFC tags, i.e., data augmentation, based on a conditional generative adversarial network (CGAN). By using the RF waveform of NFC tags which is collected from the testbed with software defined radio (SDR), we have confirmed that the realistic RF waveform can be generated through our proposed scheme.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.01a
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• pp.167-168
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• 2023

본 논문에서는 저전력 433MHz 주파수 RF 신호가 여러 종류의 벽을 투과할 시 신호에 일어나는 감쇠를 비교한다. 국내에서 기존의 와이파이, 블루투스 같은 고주파수 대역의 RF 신호에 관한 연구 및 실험은 많이 행해지었지만, 한국의 전파 관리법에 의해 성능이 제한된 비면허 주파수인 433MHz 대역의 RF 신호에 관한 연구는 매우 적게 이루어져 있다. 이러한 저주파수 대역 신호의 가장 큰 장점은 장거리 통신에 능하고 벽 투과특성이 뛰어나다는 것이다. 본 논문에서는 실험을 통해 433MHz 대역 RF 신호가 여러 종류의 장애물을 통과 시 신호 세기가 어떻게 변하는지 각각 비교하고 이를 통해 비가시 영역에서 저전력 주파수 통신의 사용 가능성을 확인한다.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.2
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• pp.60-70
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• 2002

최근 고성능/고집적 RF 소자 및 시스템들의 경박 단소화 추세에 따라 RF 무선 통신 분야에도 초소형미세 가공 기술인 MEMS 기술이 크게 주목받고 있다. 이에 본 고에서는 RF 부품 및 시스템을 MEMS 기술로서 실장하는 RF MEMS 패키지 기술에 대하여 간단히 살펴보았다. 우선, 실리콘 기반의 MEMS 패키지가 우수한 열 전달 특성과 저 손실의 고주파특성으로 인해 RF 시스템의 실장에 매우 적합함을 확인하였다. 또한, MEMS 기술을 이용함으로써 RF회로와 패키지 제작 공정이 동시에 이루어질 수 있도록 하는 일괄터리공정에 대하여 소개하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.5
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• pp.854-859
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• 2009

Many pilot projects are developed using USN(Ubiquitous Sensor network). Recently USN has more attention to be used for the applications of circumstance monitoring. In order to acquire information from sensor nodes, sensor nodes need a RF transceiver. In this paper we describe the design of a RF transceiver, based on IEEE 802.15.4, for sensor nodes operating in 2.4GHz frequency band. The architecture to be implemented and the electrical performance specifications satisfied IEEE 802.15.4 are presented. The noise figure of a receiver, selectivity, phase noise of a frequency synthesizer, transmitter's linearity and spectrum mask are derived as a design parameters from the specifications of IEEE 802.15.4.

• The Journal of the Korea institute of electronic communication sciences
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• v.3 no.4
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• pp.282-288
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• 2008

In this paper, the Passive Intermodulation Distortion(PIMD) of high power RF Filter is measured with filter inner coating materials and we suggest how to reduced the PIMD of RF filter coating methods. According to the standard measurement regulation by IEC, the Passive Intermodulation Distortion of Wibro relay high power filter are measured. We suggest the coating materials and coating methods of high power filter inner structure to reduce the PIMD generating by insert loss and worse flatness of filter delay in the design of Wibro high power filter efficiently.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.1004-1007
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• 2005

This paper presents a programmable RF BIST (Built-in Self-Test) circuit for low noise amplifiers. We have developed a new on-chip RF BIST circuit that measures RF parameters of low noise amplifier (LNA) using only DC measurements. The BIST circuit contains test amplifier with programmable capacitor banks and RF peak detectors. The test circuit utilizes output DC voltage measurements and these measured values are translated into the LNA specifications such as input impedance and gain using the mathematical equations. Our on-chip BIST can be self programmed for 1.8GHz, 2.4GHz and 5.25GHz LNA for GSM, Bluetooth and IEEE802.11g standards.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.2A
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• pp.66-79
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• 2005

In this paper, we have performed the analysis of RF transceiver system and communication link for the improvement in reliability of Smart-UAV(Unmanned Aerial Vehicles) Data-Link. The system analysis performed using the development specification of the data link and data sheet of using components through the system simulation tool that is Agilent EEsof ADS. Also, the communication link analysis peformed using a variety of propagation models for the smart UAV operation environments. As a result, we have presented problems appeared in the simulation results and development specification. As well as, we have presented about several problems and consideration issue for system design through the communication link analysis.